Astronomers have modelled the collision object in the Kuiper Belt of Arrogate with another body, resulting in a large crater. Such a cataclysm could destroy the bridge and cause rearrangement of the double system, however, if the substance TRANS-Neptunian objects actually stronger linked to each other, then the impact only led to a small increase in period of rotation. Article published in the journal The Astrophysical Journal Letters.
2014 MU69 or Arrarat refers to the cold populations of the classical Kuiper Belt objects. This planetesimal, remaining almost unchanged from the early Solar system, a year which lasts 295 earth years. 1 January 2019 close of Arrogate flying interplanetary station New Horizons, which for the first time in history, have detailed pictures of the TRANS-Neptunian object from the Kuiper Belt. Collected machine data to learn more about the composition and formation mechanisms of planetesimals in the early Solar system, which later formed the planets and their satellites.
Arricot is a contact binary system of ellipsoidal bodies can be inscribed in a sphere with a diameter of 18.3 kilometer. The center of mass of the object is inside of a large proportion, and the period of rotation around its own axis is 15.92 hours. Bipartite systems among TRANS-Neptunian objects and comets are not uncommon, they can be formed by many different processes such as soft merge features formed during the initial agglomeration of gas and dust in the nebula protocolecho or when a catastrophic collision of two bodies. These systems are structurally weak place in the area of the isthmus between the lobes, the destruction or severe erosion which the system can decay.
In the case of Arrogate his two shares of the bridge is connected, which is formed by the adhesion of the bodies at a low speed of about several meters per second. On the surface of the lower proportion of the object is a round basin, Maryland, with a diameter of seven kilometers, considered to be the largest impact crater on Arrogate. An object that could create such a formation, had to have a width of several hundred meters and to move relative to Arrogate at a speed of about 6400 kilometers per hour. If such a cataclysm occurred after the formation of the double system, it could seriously damage its components. This raises the question of how Arrogat have experienced a similar event.
Astronomers led by Masatoshi Hirabayashi (Masatoshi Hirabayashi) of Auburn University has published the results of the simulations Arrogate collision with another body, the purpose of which was the understanding of the strength of the system and possible scenarios of its evolution after the cataclysm. A large proportion of Arracacha in the models is a triaxial ellipsoid with a size of 22×20×7 km, while a smaller share is a sphere with a radius of 6.3 kilometer.
It turned out that even if we consider the case of the shock body, the radius of which is 111 meters, it will change the period of rotation of Arracacha just four minutes. To clash did not affect the jumper, the substance of Arracacha should have a greater adhesion strength, at least tens of kPa, depending on density. If this is true, then the current knowledge about the adhesion strength of small bodies of the Solar system may need to be revised. As an alternative, scientists have suggested that a collision with another body led to the destruction of the jumper and modify the system, in this case, estimation of the volume density of Arracacha is from 300 to 500 kilograms per cubic meter, which is consistent with the average density of the nucleus of comet Churyumov — Gerasimenko, which is equal to 530 kilograms per cubic meter.
Earlier we talked about how the astronomers found out that the nucleus of the comet Churyumov — Gerasimenko could have formed when moving the direct collision of two cometesimals.